Android 使用Canvas在图片上绘制文字的方法

Paint mp = new paint();
mp.setTypeface(Typeface.DEFAULT_BOLD)

Paint mp = new Paint();
Typeface font = Typeface.create(Typeface.SANS_SERIF, Typeface.BOLD);
p.setTypeface( font );

Paint mp = new Paint();
mp.setFakeBoldText(true); //true为粗体，false为非粗体
mp.setTextSkewX(-0.5f);  //float类型参数，负数表示右斜，整数左斜
mp.setUnderlineText(true); //true为下划线，false为非下划线
mp.setStrikeThruText(true); //true为删除线，false为非删除线

mp.setTextSize(); //设置字体大小，int型，如12
mp.setStrokeWidth(w); //设置线宽，float型，如2.5f，默认绘文本无需设置（默认值好像为0），但假如设置了，再绘制文本的时候一定要恢复到0

private void drawNewBitmap(ImageView imageView, String str) {
   Bitmap photo = BitmapFactory.decodeResource(this.getResources(), R.drawable.background);
   int width = photo.getWidth();
   int hight = photo.getHeight();
   //建立一个空的Bitmap
   Bitmap icon = Bitmap.createBitmap(width, hight, Bitmap.Config.ARGB_8888);
   // 初始化画布绘制的图像到icon上
   Canvas canvas = new Canvas(icon);
   // 建立画笔
   Paint photoPaint = new Paint(); 
   // 获取更清晰的图像采样，防抖动
   photoPaint.setDither(true); 
   // 过滤一下，抗剧齿
   photoPaint.setFilterBitmap(true);
   
   Rect src = new Rect(0, 0, photo.getWidth(), photo.getHeight());// 创建一个指定的新矩形的坐标
   Rect dst = new Rect(0, 0, width, hight);// 创建一个指定的新矩形的坐标
   canvas.drawBitmap(photo, src, dst, photoPaint);// 将photo 缩放或则扩大到dst使用的填充区photoPaint
　　　　　　//自定义的画笔
   TextPaint textPaint=myTextPaint();
 　　　　 drawText(canvas,textPaint,str,45,hight/5,width);
   
   canvas.save(Canvas.ALL_SAVE_FLAG);
   canvas.restore();
   
   imageView.setImageBitmap(icon);
   saveMyBitmap(this,icon);
 }

//设置画笔的字体和颜色
 public TextPaint myTextPaint(){
   
   TextPaint textPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);// 设置画笔
   int TEXT_SIZE = Math.round(25 * getRATIO());
   textPaint.setTextSize(TEXT_SIZE);// 字体大小
    textPaint.setTypeface(Typeface.DEFAULT_BOLD);// 采用默认的宽度
    textPaint.setColor(Color.argb(255,94,38,18));// 采用的颜色
    return textPaint;

//写入文字，自动换行的方法
 public void drawText(Canvas canvas, TextPaint Paint,String textString,int x,int y,int width) { 
  //int Width=Math.round(width* getRATIO());
  int start_x=Math.round(x * getRATIO());
  int start_y=Math.round(y * getRATIO());
  StaticLayout staticLayout=new StaticLayout(textString, Paint, width-start_x*2, 
        Alignment.ALIGN_NORMAL, 1.5f, 0.0f, false); 
   
  //绘制的位置 
  canvas.translate(start_x, start_y); 
  staticLayout.draw(canvas); 
 }